Fuel burner



July 23, 1935. c. EfLUcKE FUEL BURNER Filed Nov. 14,1930

4 sheets-snep 1 12g/igor@ 1 v Y C2 ATToRNYs July 23, 1935. C E. LUCKE 2,008,671

Y FUEL BURNER Y v Filed Nov. 14, 1930 4 Sheets-Sheet 2 INVENTOR l Wf/auuw e ATroRNEY:4

July 23, 1935. C. E. 'LUCKE v2,008,671

v FUEL BURNER Filed Nov. 14, 1950 4 Sheets-Sheet 5 FIGA? v ATT'oRNEYa July 23, 1935l f c. E. I UcKE 2,008,671

f FUEL BURNER Filed Nov.V 14, 19:50 v4 sheets-sheet 4 aaosi n FUEL BURNER CharlesV E. Lucke, New

Fuller Lehigh Company, Fullerton, P

poration of Delaware Application November 14, 1930, Serial No. 495,561

2 Claims.

This invention relates to a fuel burner by means of which fuel in `suspension in primary air is projected into a furnace. tion hot secondary air, even up to the temper- 5 ature of ignition of the fuel, can be introduced into the furnace, together with the primary .air

and fuel and the burner nozzle is protected from the intense heat.

The invention will be understood from the del scription in connection with the accompanying drawings in which Fig. 1 is a horizontal section through an illlustrative embodiment of the invention; Fig. 2 is a similar section through a modification of the nozzle extension; Fig. 3 is a section along the line 3 3 of Fig. 4 showing a modification; Fig. 4 is a vertical section along the line 4 4 of Fig. 3 and Fig. 5 is an elevation viewed from the inside of the furnace as indicated by the line 5 5 of Fig. 3.

In the drawings there is shown a fuel burner I, through which primary air and fuel, for example pulverized coal, is projected. into a furnace. A wall of the furnace is shown made up of a row of water wall tubes 2 and tile 3 that are attached to the tubes. Y

A secondary air casing 4 is provided into which heated secondary air is introduced and then passes into the furnace along opposite sides of the stream of fuel and primary air. The casing 4 is provided with a lining of heat insulating material 5. The casing4 isprovided with inclined plates or partitions 6 leaving a space 'I for cooling fluid, for instance, air that is approximately triangular in cross section.

A nozzle extension 8 is provided inside the casing 4 at the exit end of the burner I. The nozzle extension 8 is provided with ribs 9 to aid in keeping the same cool by contact with the air that is passed through the space 1.

Two of the tubes 2 that are indicated by the reference character Ill are bent outwardly where the end of the nozzle 8 is located to extend beyond the plane of the other tubes 2. staggered blocks or tile II are located in the spaces between the bent portions' I0 of the tubes and the adjacent tubes 2, thus providing staggeredopenings I2 from opposite sides of the air casing 4, so that the staggered streams of hot secondary air from this casing impinge against opposite 50 sides of the stream of fuel and primary air entering from the nozzle extension 8. evident that the blocks are staggered in such a manner that the secondary air-ports or openings are disposed at alternate elevations on either side of the fuel nozzle. The end of the nozzle exten- By the present inven- It will beV York, N. Y., assignor to a., a cor- (Cl. 11G-28) sion 8 is provided with rounded portions I3 to t closely against the tubes Iii and the opening through the nozzle extension 8 is so shaped that a wide, thin stream or sheet of fuel and air passes through the long, narrow outlet I4 between the tubes I0 and parallel thereto. It will be clear that the construction just described permits the use of secondary air of extremely high temperature and even a temperature above the coking point of the fuel used. By cooling the fuel nozzle coking therein is prevented.

' In the modification shown in Fig. 2 the opening I5 through the nozzle extension 8 is made of sinuous form with a straight extension at its exit so that radiant heat from the furnace will be prevented from reaching the rear portion thereof.

By providing the space 'i in the casing 4 a cooling iiuid such as air can be passed through this space to cool the nozzle extension 8 in addition to thecooling effect of the tubes I that are inV contact with the end thereof. The air that is heated thereby-.may be passed to the furnace for combustion purposes.

In the modification sho-wn in Figs. 3, 4 and 5 the fuel burner i6 extends into Contact with the tubes I9 and the portion Within the casing 4 is surrounded by a Water jacket I "I, the top of which opens intoy the casing 4, as indicated at I8 (Fig. 4) so that any vapors that may be generated in the jacket Il can pass into the secondary air casing 4 and thence into the furnace. A valve inlet pipe IS is provided for supplying water to the jacket Vi. An overflow 29 is provided near the upper end of the jacket Il and a valved drain pipe 2l is provided at the bottom thereof.

Condenser circuiating water may be'circulated through the jacket I? or a xed water level may be kept in this jacket by supplying merely the amount of water that is evaporated therefrom. Of course a sinuous nozzle may` be used in this vmodification as well as the other one to stop radiant heat from reaching the rear portion of the fuel passage.

By this invention the nozzle is not only protected against the heat from the hot secondary air, but is also protected against heat radiated from the furnace, so that when carbonizing coal is used the passage therefor will not become clogged up. The nozzle itself is also protected from the heat, thus avoiding distortion, cracking or burning the same. By thus protecting the nozzle itself secondary air of extremely high temperature may be employed, thus securing the advantage of shorter flame and more efficient comn bustion than can be realized with other constructions.

Iclaim:

1. In a furnace having a wall, a fuel burner 5 nozzle arranged to project primary air and fuel through said wall in the furnace, a casing for secondary air, said nozzle extending through said casing, a tube in the furnace wall in contact with the end of said nozzle for cooling the same, a

10 jacket for cooling fluid surrounding said nozzle,

and ribs on said nozzle extending outwardly thereof into said jacket for contacting with the cooling fiuid therein to cool said nozzle.

positioned between said air conduit and said 10 nozzle.

CHARLES E. LUCKE.

oERTmoATt: ot oomootioii.

Patent No. 2,008,671. July 23, 1935.

CHARES E. LUCKE.

It is hereby Certified that erro appears in the pinted specitioation of the above numbered patent tequiring confection as toiiows: Page i, first column, line 33, after "air" insert a comma; and page 2, first column, line 6, claim l, for "in" read into; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and ooaiod this 26th oy of November, A. D. 1935.

Leslie Frazer (Seal) Acting Commissioner of Patents. 

